AppDelegate.swift

import PushKit
import AdSupport
import Foundation


class AppDelegate: UIResponder, UIApplicationDelegate {
    var voipRegistry:PKPushRegistry!
    
    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        
        //register for notifications
        registerVoipNotifications()
        return true
    }
    
    
    
    //PushKit functions
    func registerVoipNotifications() {
        let types:UIUserNotificationType = [UIUserNotificationType.Badge, UIUserNotificationType.Sound]
        let notificationSettings = UIUserNotificationSettings(forTypes: types, categories: nil)
        UIApplication.sharedApplication().registerUserNotificationSettings(notificationSettings)
    }
    
    func application(application: UIApplication, didRegisterUserNotificationSettings notificationSettings: UIUserNotificationSettings) {
        voipRegistry = PKPushRegistry(queue: dispatch_get_main_queue())
        voipRegistry.delegate = self
        voipRegistry.desiredPushTypes = Set([PKPushTypeVoIP])
        Logger.debug("VOIP Push registered")
    }
}

extension AppDelegate: PKPushRegistryDelegate{
    func pushRegistry(registry: PKPushRegistry!, didUpdatePushCredentials credentials: PKPushCredentials!, forType type: String!) {
        let pushToken: String! = credentials.token.description
        Logger.debug("\n\n##### PushKit credential: %@\n\n", pushToken)
    }
    
    
    
    func pushRegistry(registry: PKPushRegistry!, didReceiveIncomingPushWithPayload payload: PKPushPayload!, forType type: String!) {
        let data = payload.dictionaryPayload
        Logger.debug("\n\n##### Received PushKit Data:  %@ \n\n", data)
    }
}

Logger.debug just wraps the NSLog.